π/4-QPSK调制技术实现方法设计及其性能分析

Method of design and performance analysis of π/4-QPSK modulation technology

π/4-QPSK调制技术是新一代集群通信系统的关键技术,由于用户和无线业务的不断增加,无线电频率资源越来紧缺,该技术可以极大地提高频率利用率,在同样的带宽下可以满足更多的频率需求,并且误码率更低,通信质量更好。通过分析π/4-QPSK调制技术的原理,从理论上提出该技术的具体实现方法,并使用该方法对QPSK和π/4-QPSK两种调制技术的频谱特性和误码率特性进行了计算分析和仿真分析,得出了在通过带限或非线性信道时,π/4-QPSK的信号频谱特性和误码率特性都优于QPSK信号。

π/4-QPSK modulation is a key technology in new generation of trunking communication system, due to the continuous increase of users and radio service, radio frequency resources are becoming scarce, this technology can greatly improve the utilization of frequency, in the same bandwidth can satisfy the demand of more frequency, and lower BER, better communication quality. This papaer analyzes the principles of π/4-QPSK modulation technology, from the theory puts forward the concrete implementation method of this technology. And using the method it analyzes and simulates the spectrum characteristics and bit error rate characteristics of two kinds of modulation technology. At last, it shows through a band limited or nonlinear channel, signal spectrum characteristics and bit error rate characteristics of π/4- QPSK are superior to that of QPSK signal.